According to Gortz & Sturgess, the Luger in question was one of 1500 parts kits delivered by DWM in December, 1907, and would take serial numbers up to 9000. There was a delay in assembling the parts kits until mid-1908 when W+F in Bern began the work. Yet another 1000 kits had been ordered and received. The 1000 kits delivered in 1908 had the new Cross-in-Shield emblem over the chamber and were numbered 9001 ~ 10000. All were completed by 7 December, 1908. Thus the Luger you ask about was assembled by W+F in Bern, Switzerland, in 1908. As Ron says, the Cross-in-Shield continued but only to to serial number 15215 and not 15915.